Obviously, it is a hunter's responsibility to be fully certain of what they are shooting at, and to operate their fire-arm(s) safely.

However, given that not everyone may be trustworthy who is out with a gun, it isn't a terrible idea to throw some blaze orange on if you are hiking/biking in an area that is open for hunting. Wheeling, I dunno. I mean, you are by your vehicle. But, its still not a terrible idea. Especially on kids.

Basically, just make yourself visible, and easy to tell apart from an animal. No one is going to shoot you intentionally, but making sure they can see you and easily identify you as a human is a good way to keep from being mistaken for game.